How do we know that Jesus is the chosen servant mentioned in Isaiah?

In Matthew 12:18, the apostle explicitly quotes Isaiah 42, stating that Jesus is the servant whom God has chosen and in whom He delights. This direct citation from Isaiah connects Jesus to the prophecy, revealing that He embodies the qualities of the servant described in detail. Furthermore, the acts of grace and mercy performed by Jesus throughout His ministry demonstrate the fulfillment of these prophetic characteristics, affirming His identity as the chosen servant who brings hope and salvation. The New Testament reinforces this understanding by presenting Jesus as the fulfillment of God's promise, showing that He is indeed the one called to restore and save His people.